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From "Hui Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7994) Detect if resevered EC Block ID is already used
Date Fri, 17 Apr 2015 01:31:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14499105#comment-14499105
] 

Hui Zheng commented on HDFS-7994:
---------------------------------

Thanks [~zhz] and [~szetszwo]
I will work on [HDFS-8167|https://issues.apache.org/jira/browse/HDFS-8167]

> Detect if resevered EC Block ID is already used
> -----------------------------------------------
>
>                 Key: HDFS-7994
>                 URL: https://issues.apache.org/jira/browse/HDFS-7994
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Hui Zheng
>             Fix For: HDFS-7285
>
>         Attachments: HDFS-7994_001.patch, HDFS-7994_002.patch
>
>
> Since random block IDs were supported by some early version of HDFS, the block ID reserved
for EC blocks could be already used by some existing blocks in a cluster. During NameNode
startup, it detects if there are reserved EC block IDs used by non-EC blocks. If it is the
case, NameNode will do an additional blocksMap lookup when there is a miss in a blockGroupsMap
lookup.



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